The linear and nonlinear optical properties of an off-center hydrogenic donor impurity in nanowire superlattices: Comparison between arrays of spherical and cylindrical quantum dots

Safarpour, Gh.; Novzari, M.; Izadi, Mohammad; Yazdanpanahi, S.

doi:10.1016/j.physe.2014.10.015

Cited by 14 publications

(3 citation statements)

References 46 publications

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“…In the past thirty years, scientists have paid considerable attention to the shape of the nanostructures, which is one of the most important factors to study the different properties of QD. In-depth researchers have been interested in spherical, cylindrical, and core/shell QD under external perturbation such as hydrostatic pressure, temperature, and electric and magnetic field [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. It is important to note that the optical properties associated with off-center hydrogenic impurity states confined in cylindrical QD with various electric and magnetic fields directions have been reported by Heyn and Duque [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

First Study on the Electronic and Donor Atom Properties of the Ultra-Thin Nanoflakes Quantum Dots

et al. 2022

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Nanoflakes ultra-thin quantum dots are theoretically studied as innovative nanomaterials delivering outstanding results in various high fields. In this work, we investigated the surface properties of an electron confined in spherical ultra-thin quantum dots in the presence of an on-center or off-center donor impurity. Thus, we have developed a novel model that leads us to investigate the different nanoflake geometries by changing the spherical nanoflake coordinates (R, α, ϕ). Under the infinite confinement potential model, the study of these nanostructures is performed within the effective mass and parabolic band approximations. The resolution of the Schrödinger equation is accomplished by the finite difference method, which allows obtaining the eigenvalues and wave functions for an electron confined in the nanoflakes surface. Through the donor and electron energies, the transport, optoelectronic, and surface properties of the nanostructures were fully discussed according to their practical significance. Our findings demonstrated that these energies are more significant in the small nanoflakes area by altering the radius and the polar and azimuthal angles. The important finding shows that the ground state binding energy depends strongly on the geometry of the nanoflakes, despite having the same surface. Another interesting result is that the presence of the off-center shallow donor impurity permits controlling the binding energy, which leads to adjusting the immense behavior of the curved surface nanostructures.

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Section: Introductionmentioning

confidence: 99%

First Study on the Electronic and Donor Atom Properties of the Ultra-Thin Nanoflakes Quantum Dots

et al. 2022

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“…Many works were devoted to the study of optical properties of hydrogenic impurities in quantum dots via the calculation of parameters that we mentioned. Among these works, we can cite those of Yilmaz and Safak [20], Tas and Sahin [2], Holovatsky et al [21] who both studied the case of spherical quantum dots and those of Safarpour et al [22] who were rather interested by the case of cylindrical quantum dots and have studied the off-center effects.…”

Section: Introductionmentioning

confidence: 99%

Oscillator strengths, transition probabilities and state lifetimes of on- and off-center donor impurities in quantum dots: off-center displacement, quantum size and potential-shape effects

et al. 2021

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Nonrelativistic dipole matrix elements, oscillator strengths, transition probabilities and states lifetimes of quantum dots with centered and off-centered hydrogenic impurities are studied. The effects of the off-center displacement combined to the shape of the confining potential are investigated. These optical parameters are found to be strongly modified by the parameters characterizing the confinement as well as by taking into account of the off-center shift. It is found that the oscillator strengths present a minimum for certain values of the confinement potential range and of the off-center displacement, principally due to the reaching of a low energy gap between the levels involved in the concerned transition. Likewise, the states lifetimes increase with the off-center displacement whatever the shape of the confinement potential is because of the reduction of the gap between the energies of the states when the displacement is no longer equal to zero.

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“…In recent years, QDs have been extensively studied due to their potential applications in high performance devices. Therefore, a great deal of works have been performed on the electronic structures [2][3][4][5][6][7], binding energies [8][9][10][11], spin effects [12][13][14][15] and optical properties [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] of QDs with different shape, size and the confinement potential by using various methods.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Zeeman splitting and Zeeman transition energies of spherical quantum dot in uniform magnetic field

et al. 2016

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The linear and nonlinear optical properties of an off-center hydrogenic donor impurity in nanowire superlattices: Comparison between arrays of spherical and cylindrical quantum dots

Cited by 14 publications

References 46 publications

First Study on the Electronic and Donor Atom Properties of the Ultra-Thin Nanoflakes Quantum Dots

First Study on the Electronic and Donor Atom Properties of the Ultra-Thin Nanoflakes Quantum Dots

Oscillator strengths, transition probabilities and state lifetimes of on- and off-center donor impurities in quantum dots: off-center displacement, quantum size and potential-shape effects

Calculation of Zeeman splitting and Zeeman transition energies of spherical quantum dot in uniform magnetic field

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